TROUBLESHOOTING
Symptom
PossibleCause
1) Display does not light and no sou nd when
1) Faulty po
werc
ord.
POWER is on.
2) Defecti
vepow
er t ransformer.
Volum e con t rol : MAX.
3) Defectiv
ep
ower svvitch.
Sque lc
hco
ntrol : co unterclockwise (CCW)
4) Defect ive rectifi
erD
131
orPo
lari
tyP
rotecto rD 130 .
2} Display lights but no sound .
1) Defect ive speaker or EXT. SPKR jack.
€.
Volum e control: MAX.
2) Defect iveau dio amplifier IC-l05
,0
128,1 29 and/or associated
Squelch cont rol: CCW
circuit com ponents.
3) Defective IF amplifier lC-l0 1 and/or associated circuit compo-
nents.
4) Defect
ivefu
nctional squelch control an
dm
ute switchin
glC-
l02 ,
103 an
d/orasso
ciated circuit compo nents .
3) Sound but display doe s not light .
1) Defective DC
-DC
converter consisting of
06,7,8
, D8,
9,10
,
Volume control : MAX.
11.
Squelch control : CCW
2) Defective fluo rescent display tub e.
3) Defect ive
DC-DC
converte r Transformer (Tl).
4) Defect ivevoltage Regulat or IC-l07 .
5) Defect ive CPU (IC-l) or associated circuit
component
s.
4) Does not scan and squelch does not ope rats .
1) Defect iveO
l19an
d/or associated circuit c
omponen
ts.
2) Defective lC-l, D119 and/or associated circuit compon ents.
3) Defective squelch circui
tcons
isting of IC-102, 103 .
5) Doe
snotsc
a
nbut
squelc
ho
perates.
1} Faul
tyco
nnectio
nbe
tween Linear and Logic P.C.B.
-'
2} Defective Keyb oard and/o ra ssociatedcircui
tcom
ponents .
3) Defective IC-1
,and/
orass
ociat
edcircu
itco
mponents.
6) Displays incorrectly and/o r
u
~a b
l
e
to ker in
', 1) Defective Keyboard and/or associated circuit.
.
c.Clrr: ct!y.
2) Defect iv
eCP
U (IC-l) and/orass ociated circuit.
,
;
,
)'
~
3) Defective IC-4, 5
,6
and/or associate d circu it.
7) Displays cor rectly at th
et
ime of programmin g,
1) Defect iv
em
emory IC·2a
nd/ora
ssociatedci rcuit.
but after scanning becomes faulty.
2) Defect ive IC-3, 9, 10 and/or associated circuit.
3) Defect ive IC-l and/or associate d circuit.
8) MANUAL scan opera tes but AUTO
1) All channel
sare
skipped (lockoutl .
scan doe s not op erate.
2) Squel
chc
ontro l
isnotadju
sted right.
9) "Zeromat ic" does not operate o r holds on a
1) Defect iv
e0125,IC-l0
4 inZ eromatic circuit.
dr
iftedf
requen
cyat
searchop
eration.
2) Discriminator coii is out of adjustment . TP
-l05sha
ll have 112
VCC (appro x, 3.0V ) in norm al receiving mode .
3) Is 6.4 MH
zadju
sted correctly?
10) All bands do not c perate but display OK.
1) Faulty connection betw een Linear and LogicPCB s.
."
2) Defect ive Oê
rv
t l in Low-pass filter.
\ /
3) Defective IC-7, 8,9
,10
and/or associated circuit.
4) DefectiveD 116 , 117 and/or associated circuit.
5) Defect ive 0 112 and /o ras sociated circ uit.
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